Plastics are energy-rich substances, which is why many of them burn so readily. Any organism that could unlock and use that energy would do well in the Anthropocene. Terrestrial bacteria and fungi which can manage this trick are already familiar to experts in the field.

Already may be used with the present perfect (I have already done that), the past perfect (I had already done it by then), the future perfect (When you arrive, the business will already have been completed) or the simple future (When you arrive, the business will already be complete).